尝试将streambuilder中的数据打印到flutter上的文本视图

import 'dart:async';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('StreamBuilder Example')),
        body: StreamBuilderExample(),
      ),
    );
  }
}

class StreamBuilderExample extends StatefulWidget {
  @override
  _StreamBuilderExampleState createState() => _StreamBuilderExampleState();
}

class _StreamBuilderExampleState extends State<StreamBuilderExample> {
  final StreamController<String> _controller = StreamController<String>();

  @override
  void initState() {
    super.initState();
    // 模拟每隔一秒发出一个新的字符串
    Timer.periodic(Duration(seconds: 1), (Timer t) {
      _controller.add('Data ${DateTime.now()}');
    });
  }

  @override
  void dispose() {
    _controller.close(); // 记得关闭控制器
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Center(
      child: StreamBuilder<String>(
        stream: _controller.stream,
        builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
          if (snapshot.hasData) {
            return Text(snapshot.data!);
          } else if (snapshot.hasError) {
            return Text('Error: ${snapshot.error}');
          }
          return CircularProgressIndicator(); // 显示加载指示器
        },
      ),
    );
  }
}